Electric-arc furnace.



c. 0. A. 'DO'VLE. ELECTRIC A'Rc FURNACE.

APPLICATION FILED APR-13, I915.

Patented Sept. 12, 1916.

CARL OLA]? ANDERSEN DUVLE, 0F NOTODDEN, NORWAY, ASSIGNOR, T0 NURSE-HYDRAU- ELEKTRISK KVAELSTOFAKTIESELSKAB, OF CHRISTIANIA, NORWAY.

ELECTRIC-ABC FURNABE.

- Specification of Letters Patent.

Patented Sept. 12, 119111 Application filed April 13, 1915. Serial No. 21,033.

To all whom it may concern:

Be it known that I, CARL OLrir Annnnsnu DijVLE, a subject of the King of Norway, residing at Notodden, Norway, have invented certain new and useful Improvements in Electric-Arc Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains td make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

The present invention relates to electric arc furnaces and has for ts ob ect to provide supporting means for the electrodes of such furnaces, which will make it possible to dispose the'arc in any desired part of the fur-- nace and also to permit adjustment of the electrodes so as to regulate the distance between their points viz. the length of the electric arc in accordance with the current tension and the conductivity of the gases.

Another object of the invention isto provide supporting means for the electrodes for polyphase furnaces which will permit a correct angular disposition of the electrodes relatively to each other.

The invention is adapted for metallurgical as wellas for gas furnaces where an elec tric are is used.

()n the drawings: Figure 1 is a diagrammatical sketch of an electric arc gas furnace provided with the presentinvention. Figs. 2, 3 and 4 are details showing several forms of electrode supports on a larger scale.

According to Fig. l the electrodes at are slidably mounted in balls Z), which rest in suitable sockets in the furnace wall. @Wing to this mounting it will be noticed, that the electrodes can be approached toward each other by sliding in the bore through the ball in which they are mounted, and at the same time the ball and socket joint permits angular displacement.of both electrodes in different planes, so that in fact the electrode points may be placed in any convenient part of the furnace.

On Fig. 2 is shown a ball and socket support of the type referred to. In accordance with this form of the invention the ball 6".

is mounted between the inner sphei ica-l parts of the neck bushes c, d, which may be fastened to the furnace Wall 7 in any conven introduced between the two neck bushes to secure a gas-tight fit. The ball piece 5 should be made of insulating material such as porcelain, stone, glass or the like and for high tension currents the neck bushes c, (I should also be insulating.

According to the modification shown on Fig. 3 the part b in which the electrod'ea is slidably mounted is not spherical, but is passed through a salient packing e of yield ing material, which permits angular adjustment of the part 6' within certain limits. The packing e is supported between the two neck bushes c, d. Also in this construction the different parts of the electrode support may be made of insulating material. It will be noticed that a triple insulation may be obtained if all the supporting parts are made insulating.

Fig. 4 illustrates the application of the present invention on a furnace in which electrodes are steadied by means of braces inside the furnace. In furnaces of this type the electrodes must be permitted to swing about their connection point with the braces inside the furnace even if such braces may also be made adjustable.

According to the construction shown on Fig. 4 the electrode a is supported at the point g by means of braces 7c. The furnace wall 7- is provided with a large opening Z, in which the electrode can move freely in all directions. A. collar on is arranged around the opening Z and is adapted to cooperate with a cap a pressed against the said collar by means of springs h. The cap n is slidably mounted on the electrode a and the whole arrangement forms a gas tight tlti tilt

ttti

tilt

Mid

said electrode inside said furnace, an open I ing in the furnace wall for introducing the electrode, said opening being of a larger diameter than the electrode, a collar surrounding said'opening, a spherical cap s1idthe support and projecting through an aperture in said wall of larger diameter than the electrode, a collar surrounding said ap- 10 erture, and a spring urged spherical cap slidable 0n the collar and on the electrode, to form a gas tight oint with the collar.

In testlmony that I elalnl the foregoing ax my invention, I have signed my name Ill presence of two suhscrilung \YltIlCSSOS.

CARL our AXDERSEN UUVLE.

'itnesses:

C. I. IIANSEN.

Copies of thi patenfi may be obtained for flv e cents each, by addressing the Commissioner of Yatents,

Washington, D. G. 

